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United States Patent |
5,503,047
|
Brockington
|
April 2, 1996
|
Cordless electric corkscrew
Abstract
A mechanized corkscrew powered by a cordless electric screwdriver, that
mimics a winged manual corkscrew, wherein the mechanized corkscrew has a
bell shaped flange on a sliding element that retracts up a twin threaded
shaft as the corkscrew is twisted into the cork, and then, once the
corkscrew is embedded in the cork, the sliding element traverses back down
the twin threaded shaft, the resulting action causing the corkscrew to
pull the cork out of the bottle.
Inventors:
|
Brockington; F. Rhett (4016 MacGregor Dr., Columbia, SC 29206)
|
Appl. No.:
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372306 |
Filed:
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January 13, 1995 |
Current U.S. Class: |
81/3.2; 81/3.29; 81/3.45 |
Intern'l Class: |
B67B 007/04 |
Field of Search: |
81/3.2,3.29,3.45
|
References Cited
U.S. Patent Documents
5031486 | Jul., 1991 | Rydgren.
| |
5079975 | Jan., 1992 | Spencer.
| |
5086675 | Feb., 1992 | Leung.
| |
5095778 | Mar., 1992 | Bocsi et al. | 81/3.
|
Foreign Patent Documents |
2660299 | Mar., 1990 | FR.
| |
1920224 | Nov., 1970 | DE | 81/3.
|
3713263 | Nov., 1988 | DE | 81/3.
|
Primary Examiner: Smith; James G.
Attorney, Agent or Firm: Brockington; F. Rhett
Claims
I claim:
1. A mechanized corkscrew consisting of a corkscrew apparatus and a
mechanized power source, wherein the corkscrew apparatus consists of the
following:
a corkscrew distally mounted on a twin threaded shaft, wherein the twin
threaded shaft has a continuous thread;
a sliding element consisting of:
a tubular slide comprised of a receiving chamber, a bell shaped flange, and
a cork chock,
a translational bearing for traversing movement over the twin threaded
shaft,
a follower which is a pawl that forces the sliding element to track the
continuous thread, back and forth over the twin threaded shaft, as the
twin threaded shaft rotates,
a keyway which prevents the sliding element from rotating;
a housing consisting of:
a collet chamber for mounting the corkscrew apparatus to the mechanical
power source,
a slide chamber for housing the sliding element and fitted with a
complementary keyway which interlocks with the sliding element and
prevents the sliding element from rotating,
a stationary bearing for supporting the twin threaded shaft.
2. A mechanized corkscrew consisting of a corkscrew apparatus and a
mechanized power source, wherein the corkscrew apparatus consists of the
following:
a corkscrew distally mounted on a twin threaded shaft, wherein the twin
threaded shaft has a continuous thread;
a sliding element consisting of:
a tubular slide comprised of a receiving chamber, a bell shaped flange, and
a cork chock,
a translational bearing for traversing movement over the twin threaded
shaft,
a follower which is a pawl that forces the sliding element to track the
continuous thread, back and forth over the twin threaded shaft, as the
twin threaded shaft rotates,
a keyway which prevents the sliding element from rotating;
a housing consisting of:
a collet chamber for mounting the corkscrew apparatus to the mechanical
power source,
a slide chamber for housing the sliding element and fitted with a
complementary keyway which interlocks with the sliding element and
prevents the sliding element from rotating,
a stationary bearing for supporting the twin threaded shaft,
a spring, located between the stationary bearing and the sliding element,
that decompresses during extraction of a cork, therein augmenting
extraction.
3. A mechanized corkscrew as claimed in claim 1, wherein said mechanized
power source is an in-line, cordless electric screwdriver.
4. A mechanized corkscrew as claimed in claim 3, wherein said in-line,
cordless electric screwdriver is capable of producing at an output speed
of 180 rpm, a dynamic torque of 2.7 Newton-meters, and said in-line,
cordless electric screwdriver is interchangeably fitted with a
rechargeable battery.
5. A mechanized corkscrew as claimed in claim 1, wherein said continuous
thread of the twin threaded shaft is a deeply cut groove with a pitch that
substantially matches the pitch of the corkscrew, with an over-all
threaded length of 40 mm.
6. A mechanized corkscrew as claimed in claim 1, wherein said twin threaded
shaft has a hexagonal shaped proximal end that can insert into the collet
of an in-line, cordless electric screwdriver, and a set of retaining snap
rings and circumferential grooves that position the twin threaded shaft in
the stationary bearing.
7. A mechanized corkscrew as claimed in claim 2, wherein said spring is a
compression spring that when fully compressed has a decompression force of
approximately 30 Kg.
8. A mechanized corkscrew as claimed in claim 1, wherein said cork chock is
a graduated ridge that runs along a distal longitudinal sectional portion
of the receiving chamber.
9. A mechanized corkscrew as claimed in claim 1, wherein an exterior
surface of the tubular slide of the sliding element is lined with
graduations which indicate how far the cork has been extracted.
10. A mechanized corkscrew as claimed in claim 1, wherein the housing has a
quick connect means for rapidly fastening the corkscrew apparatus to the
mechanized power source.
Description
The invention relates generally to corkscrews and more particularly to
mechanized corkscrews which are driven by electrical motors powered by a
battery energy source.
BACKGROUND
Cork, (Gk. phellos), is a compressible wood having low water absorption
derived from the meristem bark of live oaks. It has been known to be in
use since 400 BC. Cork has been used to close bottles, and in particular
wine bottles, since the 1600's. The elastically compressible nature of
cork, coupled with its low absorption of water, make it ideally suited as
a closure material, because it conforms to openings, even those having a
somewhat irregular shape, forming a water tight seal.
Cork is still in use today by wine vintners, in part because of its
historically proven successful performance, and also because it embodies
the public's perception of the bottling method of choice, especially for
finer wines. A certain savoir faire is often associated with the opening
of a bottle of wine, and a variety of uncorking devices have been
developed to assist in the presentation. The uncorking task is complicated
by the nature of the cork material. While cork is elastically
compressible, it is also somewhat friable, and is subject to crumbling
when dry or exposed to excessive force. Being a natural product there is
also an inherent degree of nonhomogeneity. The cumulative effect of these
factors has resulted in a plethora of uncorking devices. Most of the more
recent inventions use a worm-like helical "shaftless" corkscrew to
minimize the over-all expansion of the cork when the corkscrew is
inserted. Expansion is undesirable as it increases the radial force on the
perimeter of the cork against the interior wall of the neck of the bottle,
making the cork harder to extract. The older type of corkscrew is the
auger "shaft" type corkscrews. The inserted "shaft" tends to expand the
cork outwards, making uncorking more difficult. Rydgren U.S. Pat. No.
5,031,486 discusses this effect. Note, that both types of corkscrews have
a very low thread count with a high degree of pitch and a wide flight so
as to distribute the twisting action through out the cork, therein
reducing the probability of the cork crumbling. Other, uncorking devices
have been described in the literature, such as needles through which a gas
is pumped into the bottle, but in general these techniques have not
enjoyed the commercial success of the corkscrew.
Mechanized corkscrews, and in particular electric corkscrews, have been
described in the prior art, as a means of automating the uncorking
process. Manual uncorking using a corkscrew is not particularly physically
rigorous, however it does require a repetitious twisting action, which can
become difficult after several bottles. The twisting action can be
extremely painful for someone with arthritis, or carpal tunnel syndrome.
Mechanized corkscrews alleviate the twisting action, and all but eliminate
the physical effort, however, generally, with coincident deleterious
effects on the cork. For instance, Spencer U.S. Pat. No. 5,079,975
discloses an automatic corkscrew, wherein the force of the rotating
corkscrew extracts the cork into the "extraction tube" . During the
extraction, the corkscrew penetrates through the base of the cork, which
can result in cork grinds being conveyed into the bottle. Secondly, the
torque required to extract the cork is on the order of 2-3 times the
torque required to twist the corkscrew into the cork, reaching a peak
torque just prior to the cork yielding to the extraction forces. Twisting
the corkscrew into the cork requires only approximately 1 Newton-meter,
however to pull the cork out using a corkscrew with a 45 degree pitch (1.4
mechanical advantage) varies depending on the percent of compression and
nature of the cork, but is generally on the order of 2.5-3.5
Newton-meters. This level of torque would create a pulling force of 26 to
38 Kg on the cork. This is sufficient force to cause considerable grinding
action on the cork by the rotating corkscrew, hence the coincident
deleterious effects on the cork.
Another consideration, particularly for battery powered corkscrews as
disclosed in Spencer U.S. Pat. No. 5,079,975, is that the readily
available commercial drivers have only a finite amount of dynamic torque.
The dynamic torque, while being more than adequate for twisting in the
corkscrew, is, without gear reduction modification or a much more
expensive driver, marginal at the peak torque demand during the cork
extraction. The problem of marginal torque is further exacerbated wherein
it is desirous to extract the cork without previously removing the
packaging seal. It should be noted that in serving large parties of
people, where one is most likely to employ an electric corkscrew, the
packaging seal is frequently not removed, because it takes as much time to
take it off as it does to uncork the bottle.
Accordingly, a statement of the problem is the need for a mechanized
corkscrew which mimics the action of a manual corkscrew, wherein the
bottom of the cork is not pierced during the uncorking. Like a manual
corkscrew, the mechanized corkscrew has to be portable, being easily taken
to a table, and preferably cordless. It should rapidly de-cork(discharge
the cork), and be ready for reuse. Twisting movement should be kept to a
minimum. A further desirable feature is the ability to partially extract
the cork, such that at a later time the cork can be removed from the
bottle by hand just prior to pouring.
A narrower statement of the problem is the need for a mechanized corkscrew
which can mimic the action of a winged manual corkscrew. The winged manual
corkscrew has a sliding element that consists of a bell shaped flange and
a geared cam, lever arm assembly. The bell shaped flange aligns the
corkscrew centrally over the cork. The corkscrew is distally mounted on a
notched shaft which moves on a bearing coaxially within the sliding
element, wherein movement of the corkscrew relative to the sliding element
rotates a pair of cam shaped gears on the sliding element which are
engaged with the notched shaft. Each of the cam shaped gears has a lever
arm (wing), and the wings pivot upward as the corkscrew moves downward. To
uncork a bottle using the winged manual corkscrew, the same is positioned
atop the bottle. The bell shaped flange settles flush and collinearly with
the mouth of the bottle, therein aligning the concentric corkscrew, which
is recessed within a bore of the sliding element, with the center of the
cork. The corkscrew is twisted into the cork, and as it penetrates the
cork, moving downward relative to the sliding element, the wings are
raised. When the corkscrew has been twisted into the cork approximately 35
mm, the wings have been raised from a vertical to a horizontal position.
The cork is extracted by applying equal and downward force on the opposing
wings, which cause the corkscrew to move upward relative to the sliding
element. The cork, which is embedded with the corkscrew, is pulled out of
the bottle into the bell shaped flange and the bore of the sliding
element. The winged manual corkscrew is de-corked by counter-rotating the
corkscrew while holding the cork.
There are several features that bear some emphasis, when examining the
action of the winged manual corkscrew, which in operation is similar to
almost all manual corkscrews. The first feature is that the corkscrew is
not used as an auger for conveying the cork out of the bottle, but simply
as a means of attaching the cork to a lever arm, in this case a pair of
lever arms. The consistency of cork is such that it is likely to crumble
if augered, and some of the grinds will end up in the bottle. Secondly,
the force required to pull the cork out of the bottle can be significant,
and is variable from bottle to bottle, as a consequence of the natural
variability of cork. Thirdly, during the extraction, there is no twisting,
as this would make it difficult to keep the bottle from spinning while
simultaneously manning the corkscrew.
Therein, the instant invention is a mechanized corkscrew which mimics the
action of a winged manual corkscrew, that consists of a corkscrew
apparatus and a mechanical power source, wherein the mechanical power
source is preferably a cordless electric reversible motor powered by
interchangeable, rechargeable batteries. The instant invention is designed
to uncork a wine bottle in 3 or 4 seconds, and can be de-corked and reset
in a matter of just a few seconds.
SUMMARY OF THE INVENTION
The instant invention is a mechanized corkscrew consisting of a corkscrew
apparatus and a mechanical power source, wherein the mechanical power
source is a reversible motor. The reversible motor is preferably the type
used for in-line, cordless electric screwdrivers, which consists of a
rechargeable battery, a direct current electric motor, a planetary gear
reduction assembly linked to a hex-shaft collet, a durable plastic
housing, and a forward reverse switch. Typically the output speed is 180
rpm, having a dynamic torque of 1.6 to 2.7 Newton-meters. Two prominent
manufacturers in the United States are Skil and Black & Decker.
The corkscrew apparatus consists of a corkscrew distally mounted on a twin
threaded shaft, a sliding element, and a housing. Preferably, the
corkscrew apparatus is also inclusive of a spring, which augments the
extraction. The sliding element is substantially cylindrical in shape, and
consists of a translational bearing, a follower and a tubular slide,
wherein the sliding element is bored out more in regions that do not
function as a bearing. The tubular slide has a receiving chamber and a
bell shaped flange. The bell shaped flange centers the corkscrew on the
mouth of the bottle and tends to funnel the extracting cork into the
receiving chamber. The receiving chamber has a bore that is slightly
larger than the diameter of a wine bottle cork, and a length that is at
least twice the length of a cork. Along a sectional portion of the
longitudinal axis of the receiving chamber there is a cork chock, which
can be used to prevent the cork from rotating once it is in the receiving
chamber. The follower is a pawl that forces the sliding element to track
on the translational bearing, back and forth over the twin threaded shaft,
which has a continuous thread, as the twin threaded shaft rotates. The
sliding element has a key and a keyway that interlocks with a
complementary keyway on the housing such that, when the twin threaded
shaft rotates, the sliding element can traverse, but not rotate. The
housing is substantially a double chambered pipe with a stationary
bearing. The housing serves to mount the corkscrew apparatus to the
mechanical power source, support the twin threaded shaft, and prevent the
sliding element from rotating. The housing has a collet chamber, wherein
the twin threaded shaft is linked to the mechanical power source, and in a
preferred embodiment this is the collet of the cordless electric
screwdriver, as previously described. There is also a slide chamber, and
the slide chamber houses the sliding element. There is a substantial wall
between the collet chamber and the slide chamber which is bored out to
form the stationary bearing for the twin threaded shaft. The stationary
bearing is coaxial with the housing and collinear with the twin threaded
shaft. The stationary bearing supports the twin threaded shaft. A set of
retaining rings snapped into circumferential grooves on the twin threaded
shaft hold the twin threaded shaft in the stationary bearing. There is
preferably a spring mounted in the substantial wall on the slide chamber
of the housing. The spring is at maximum compression when the sliding
element has traversed to its furthest point of retraction, which is a
point proximal to the stationary bearing.
The instant invention mimics the action of a winged manual corkscrew as
follows. The action has two phases, the cork penetration phase and the
extraction phase. To begin the cork penetration phase, actuate the
mechanical power source until the sliding element traverses to its maximum
extension, such that the corkscrew is recessed in the receiving chamber.
Position the bell shaped flange on the mouth of the bottle to be uncorked.
The bell shaped flange settles flush and collinearly with the mouth of the
bottle, therein aligning concentrically the corkscrew, with the center of
the cork. Actuate the mechanical power source, such that the corkscrew is
rotating clockwise when viewed from above. Actuation corresponds to hand
twisting the corkscrew on the winged manual corkscrew. The threads on the
twin threaded shaft are cut with the same pitch as the corkscrew, so that
as the corkscrew penetrates the cork, the sliding element retracts at the
same rate, just like the corresponding sliding element on the winged
manual corkscrew. As the sliding element retracts it begins to compress
the spring. The corkscrew attains a depth of approximately 35 mm into the
cork before the sliding element reaches the top of its translational cycle
and starts moving downward. Downward movement of the sliding element
signifies the beginning of the extraction phase. The spring starts
decompressing, pushing the sliding element downward, releasing energy that
was stored in the spring during the cork penetration phase. This point in
the action corresponds to the point in the winged manual corkscrew cycle
when the wings are horizontal, and force is just being applied downward,
resulting in the corkscrew moving upward relative to the sliding element.
The torque requirements for the corkscrew apparatus triple in a matter of
a half turn of the twin threaded shaft, however the excess energy stored
in the spring is more than enough to compensate for the increase. The
downward movement of the sliding element presses the bell shaped flange
firmly against the mouth of the bottle causing the cork to start to move.
The pressure of the bell shaped flange tends to neutralize the twisting
action of the corkscrew as it continues to rotate. Very shortly after the
cork starts moving upward out of the bottle, the cork starts to rotate
such that there is very little additional penetration of the corkscrew
into the cork. The cork will continue to rotate until the cork chock is
engaged.
The tubular slide of the sliding element is lined exteriorly with
graduations which indicate how far the cork has been extracted. These
graduations can be useful if it is desirable to only partially uncorked
the bottle while the packaging seal has been left on the bottle, as the
cork is not easily visible. To de-cork, just reverse the mechanized power
source after engaging the cork chock, and the corkscrew will back out.
It is anticipated that through a modification to the housing, the corkscrew
apparatus can be designed such that said corkscrew apparatus could have a
quick connect means such that it could be snapped on the mechanized power
source, instead of being fastened with screws as is disclosed in the
foregoing illustrated embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the illustrated embodiment, inclusive of
the mechanized power source and the corkscrew apparatus, embodying
features of the instant invention;
FIG. 2 is a section away view of the corkscrew apparatus of the invention
illustrated in FIG. 1;
FIG. 3 is an enlarged view of the corkscrew apparatus only, illustrated in
FIG. 2;
FIG. 4 is a variation of FIG. 3, wherein the sliding element, which is
fully retracted in FIG. 3, is shown fully extended in FIG. 4;
FIG. 5 is a sectional view of the structure illustrated in FIG. 3, taken
along line 5--5 thereof;
FIG. 6A-6C are axial views of the follower, to illustrate how the pawl
tracts the continuous thread of the twin threaded shaft;
FIG. 7 is a view of the twin threaded shaft; and
FIG. 8 is a view of the worm-like helical "shaftless" corkscrew.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
Referring now to the drawings, in FIG. 1 the mechanized corkscrew 1
consists of a corkscrew apparatus 11 and an in-line, cordless electric
screwdriver 61. The electric screwdriver 61 consists of a rechargeable
battery, a direct current electric motor, a planetary gear reduction
assembly linked to a hex-shaft collet, a durable plastic housing, and a
forward / reverse switch 62. Typically the output speed is 180 rpm, having
a dynamic torque of 1.6 to 2.7 Newton-meters.
The corkscrew apparatus 11 consists of a housing 21, and a sliding element
22. The corkscrew apparatus 11 is mounted to the electric screwdriver 61
using a pair of self tapping pan head screws 42 through mounting holes 41.
FIG. 5 is a sectional view of the structure illustrated in FIG. 3, taken
along line 5--5 thereof. The sliding element 22, as illustrated, is
retracted exposing the corkscrew 12. The section view of corkscrew
apparatus 11 of the mechanized corkscrew 1 as shown in FIG. 2 illustrates
the internal workings of the instant invention, and shows the relative
position of the components. FIG. 3 is the section view of just the
corkscrew apparatus 11. FIG. 4 is the same view, except that the sliding
element 21 is in the fully extended position. Referring to FIG. 4, the
housing 21 is substantially a double chambered pipe and a stationary
bearing 32. The two chambers are the collet chamber 31 and the slide
chamber 30. There is a bore coaxial to the housing 21 between the collet
chamber 31 and the slide chamber 30, in a substantial wall which is the
stationary bearing 32. The twin threaded shaft 13 projects coaxially down
the housing 21. The proximal end of the twin threaded shaft 13 in the
collet chamber 31 has a hexagonal stem 26, which inserts into collet 63 of
the electric screwdriver 61. The twin threaded shaft 13 is supported by
stationary bearing 32, and is held in position by a pair of external
retaining rings 39, which are snapped into the respective circumferential
grooves 28. See FIG. 7 for a blow up of the twin threaded shaft 13. A
continuous thread 27 is cut into the twin threaded shaft 13, in a right
handed and a left handed thread pattern. The slide chamber 30 houses the
sliding element 22. The sliding element 22 consists of a follower 34, a
translational bearing 43 and a tubular slide 33 that is comprised of a
receiving chamber 45, a bell shaped flange 44, and a cork chock 55. The
follower 34 is a pawl that forces the sliding element 22 to track on the
translational bearing 43, back and forth over the twin threaded shaft when
it rotates. The follower is held in position, but free to rotate by
internal retaining ring 46. The follower 34 is shown from all three axial
perspectives in FIG. 6A-6C.
The sliding element 22 has a key 35 mounted in a longitudinal keyway 36
that interlocks with a complementary keyway 37 on the housing 21 such
that, when the twin threaded shaft 13 rotates, the sliding element 22 can
traverse, but not rotate. The cork chock 55 is held in position in the
receiving chamber 45 by a pair of screws 65.
A compression spring 14 is situated in a depression in the wall of the
slide chamber 30, that compresses when the sliding element 22 moves to the
retracted position shown in FIG. 3, and is fully decompressed in the
extended position shown in FIG. 4.
The corkscrew 12, as blown up in FIG. 8, is mounted on the distal end of
the twin threaded shaft 13 in a longitudinal groove 29 cut through the
axis of the twin threaded shaft 13. FIG. 7 shows the longitudinal groove
29. The corkscrew 12 is held in position by spring pin 47. The twin
threaded shaft 13 and the follower 34 are formed of 4140 steel. The
corkscrew 12 is made from chrome plated steel. The housing 21 and the
sliding element 22 are made of Nylon 6.
It is a anticipated that the entire corkscrew apparatus 11 can be
fabricated using engineering plastics.
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